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I don't know why it would just fail. What happened was I blew a radiator hose and after replacing them I have the gauge problem. What I don't understand is that upon first replacing the hoses I drove the car on the highway for 50 or so miles and the gauge read fine. On the way back it pegged it around 10 miles into it, so I had it towed and figured the t-stat wouldn't open so I got a new one and still have the problem. Why wouldn't a trapped air problem occur during the first 50 miles? I don't know. What I was thinking though is if I raised the front of the car or the left rear where the bleeders are and made one of them the highest point, ran the car until the fans kick on and the t-stat opens and then bleed that highest point I should in theory get absolutely all of the air out correct? Thanks, Steve